Patent GB-727699-A (GB)
Title: Internal combustion engine and power transmission assemblies
IPC: F02D29/00
Filed: 1953-02-02
Abstract: 727,699. Regulating. SULZER FRERES SOC. ANON. Feb. 2, 1953 [Feb. 9, 1952], No. 2933/53. Class 7(6). [Also in Groups XXIX and XXXI] In an engine driving an output shaft 5 through a hydraulic torque converter 3, a speed governor 6 controls a fuel injection pump 11 and actuates the torque regulating device of the torque converter 3 to provide a substantially constant torque input to the converter at any given speed setting within the normal running range, the torque regulating device being set so that no torque is transmitted when the governor speed control member 21 is set in the idling speed range. The governor 6 controls the pump 11 through a linkage system 8, 9, 10, which system also actuates through a link 13 the control valve 16 of a hydraulic servomotor 14 the piston 17 of which actuates the torque regulating device of the converter 3 through links 18, 19, 20. The speed control member 21 adjusts the governor load and simultaneously adjusts the pivot 15 of the link 13 to adjust the fuel supply for each speed setting. If the load on the engine increases, the governor sleeve 7 is lowered and the link 9 is moved upwards to increase the fuel supply, the valve 16 being simultaneously lowered to cause the piston 17 to move upwards to reduce the torque ratio of the torque converter 3 until the engine speed has increased and the governor sleeve has returned to its original position. If the handle 21 is rotated to set a higher speed, the governor spring abutment 23 is lowered causing an immediate increase in the fuel supply, and a reduction in the transmission ratio of the torque converter 3. Simultaneously the linkage 25, 26 raises the pivot 15 and valve 16 so that equilibrium is re-established at an increased engine speed with an increased fuel supply. When the handle 21 is rotated to the idling speed range, the linkage 25, 26 lowers the pivot 15 and valve 16 by such an amount that the piston 17 is driven to its top position and the torque regulator set so that no torque is transmitted irrespective of the action of the governor. To avoid hunting, the hydraulic fluid flow into the servomotor 14 is throttled. The hydraulic converter 3 may be of the centrifugal type with adjustable blades or of the positive displacement variable capacity pump type. In a modification, the lever 25 actuates an adjustable cylinder surrounding the valve 16 and is actuated from the speed control mechanism 21 through a cam. In Fig. 3 the lever 25 is provided with an extension 37 which, when the handle 21 is set in the idling range, depresses a valve 36 to cause a second servomotor 34 to move the torque regulating mechanism to the position in which no torque is transmitted irrespective of the position of the first servomotor piston 17. Similarly, when the handle 21 is moved from idling into the normal running range, the valve 36 is released and the torque regulating mechanism immediately set to a torque transmitting position. The valve 36 may be replaced by a servo valve connected by a feed-back arrangement to the servo piston 34 to provide a gradual adjustment of the torque regulating device in the idling range. A resilient connection may be provided in the linkage system 18, 19, 20, to avoid stressing thereof whilst the servomotor 34 is in operation. In Fig. 6 the servomotor 14 is provided with a spring-loaded throttling member 45 which is normally in a position such that an orifice 48 throttles the flow of fluid to the servo cylinder but which is moved by the lever 25 when the handle 21 is set for idling to a position in which a recess 46 provides an unrestricted supply of pressure fluid to the servomotor. A rapid movement of the piston 17 towards and away from the position in which no torque is transmitted is thereby obtained.